These areas, which we've dubbed " jump zones ," span the globe, covering 6% of Earth's land mass. That's 57% more people living in jump zones than two decades earlier, increasing the odds that a deadly bat virus could spill over. The world's jump zones have lost 21% percent of their tree cover in almost two decades' time, double the worldwide rate. Almost one-third of that expansion would be in existing jump zones, where spillover risk is already high. Though those countries require mining companies to assess potential environmental harms that new concessions might cause, none require companies to evaluate spillover risk.

---